高增益的微波光子变频智能控制方法

High gain microwave photon frequency conversion intelligent control method

针对当前微波光子变频控制方法中存在的信号增益及动态范围较小等问题,提出基于级联强制信号调制器的高增益微波光子变频智能控制方法。深入分析变频处理后所得中频信号中存在的三阶交调失真情况,在此基础上,通过调节光电探测器的响应度、光载波信号的输出功率以及调制器输入信号的振幅来抑制变频信号的三阶交调,分析不同偏置相移与本振信号功率的关系,对比微波光子变频控制方法优化前后情况,得出优化后的微波光子变频智能控制方法的三阶交调抑制效果更好。实验结果表明,高增益微波光子变频智能控制方法能够有效完成信号变频控制,且其三阶交调抑制效果更好,能够为实践应用提供一定的理论依据。

In order to solve the problems of small signal gain and dynamic range in current microwave photonic frequency conversion control method,a high gain microwave photonic frequency conversion intelligent control method based on cascade forced signal modulator is proposed.The third-order intermodulation distortion in intermediate frequency signal obtained by frequency conversion processing is deeply analyzed.On this basis,the third-order intermodulation of frequency conversion signal is suppressed by adjusting the responsivity of photodetector,the output power of optical carrier signal and the amplitude of modulator input signal.The relationship between the phase shift of different bias and the power of local oscillator signal is analyzed,and the situation before and after the optimization of microwave photonic frequency conversion control method is compared.The optimized intelligent control of microwave photonic frequency conversion is obtained.The third-order intermodulation suppression effect of the method is better.The experimental results show that the high gain microwave photonic frequency conversion intelligent control method can effectively complete signal frequency conversion control,and its third-order intermodulation suppression effect is better,which can provide a certain theoretical basis for practical application.